Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MO_2014_69_1_a4, author = {F. D. Pukhovich}, title = {External billiards}, journal = {Matemati\v{c}eskoe obrazovanie}, pages = {42--57}, publisher = {mathdoc}, volume = {69}, number = {1}, year = {2014}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MO_2014_69_1_a4/} }
F. D. Pukhovich. External billiards. Matematičeskoe obrazovanie, Tome 69 (2014) no. 1, pp. 42-57. http://geodesic.mathdoc.fr/item/MO_2014_69_1_a4/